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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A338689 a(n) = Sum_{d|n} (-1)^(d-1) * (n/d)^n * binomial(d+n/d-2, d-1).

Table of values

n a(n)
1 1
2 3
3 28
4 223
5 3126
6 44660
7 823544
8 16514047
9 387538588
10 9951176994
11 285311670612
12 8903202187413
13 302875106592254
14 11107259264162760
15 437894348359764856
16 18444492187995996159
17 827240261886336764178
18 39345059356329821149097

List of values

[1, 3, 28, 223, 3126, 44660, 823544, 16514047, 387538588, 9951176994, 285311670612, 8903202187413, 302875106592254, 11107259264162760, 437894348359764856, 18444492187995996159, 827240261886336764178, 39345059356329821149097]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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